If so. Which coil size? Improvement over the stock coils,etc? Do you get less null in iron, etc? Thinking about selling my V3i and modding a couple used excals. Not in a real hurry since its just now winter time. But during summer I prefer being in the water since its too freaking hot here to land detect much I've seen Whites BHID 300's modded with SEF coils. May try that too on my BHID?